syca – minimal sudo-like privilege elevation tool

syca is a privilege-elevation utility that allows authorised Linux users to execute commands as root. It provides an alternative to traditional sudo-style workflows, with authentication handled through Pluggable Authentication Modules (PAM).

The application combines a command-line interface with a privileged helper responsible for executing commands. Rather than relying entirely on a single privileged application, syca separates authentication and command-execution responsibilities.

Access is restricted to users belonging to the wheel group. An authorised user can prefix a command with syca to request elevated privileges, with password authentication performed according to the configured PAM policy.

One of syca’s distinguishing features is its system-wide authentication cache. Once a user successfully authenticates, the application can retain a temporary authorisation state that is shared across terminal sessions.

This can reduce repeated password prompts during a sequence of administrative operations. Unlike an authentication cache associated with a particular terminal, the cached state applies across terminals for the authenticated user.

Users can control the duration of the temporary authorisation period. The application also provides commands for inspecting the cache and disabling previously granted temporary access.

The project is intended for Linux systems and uses a relatively compact execution model. Administrators should review the authentication cache and privilege boundaries carefully before adopting it as their primary administrative utility.

This is free and open source software.

Key Features

• Execute commands with root privileges.
• Authenticate users through PAM.
• Use a privileged setuid helper for command execution.
• Restrict access to members of the wheel group.
• Maintain an authentication cache for authorised users.
• Share cached authentication state across terminal sessions.
• Enable temporary root authorisation for a configurable period.
• Disable cached authorisation manually.
• Display the current authentication cache status.
• Allow repeated administrative commands without prompting for a password while authorisation remains valid.
• Provide straightforward command-line controls for privilege elevation.

Website: github.com/0xraincandy/syca
Support:
Developer: Remilia Litjens
License: GNU General Public License v3.0

syca is written in Python and C. Learn Python with our recommended free books and free tutorials. Learn C with our recommended free books and free tutorials.

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